[openssh.git] / sshpty.c

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Allocating a pseudo-terminal, and making it the controlling tty.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

#include "includes.h"
RCSID("$OpenBSD: sshpty.c,v 1.7 2002/06/24 17:57:20 deraadt Exp $");

#ifdef HAVE_UTIL_H
# include <util.h>
#endif /* HAVE_UTIL_H */

#include "sshpty.h"
#include "log.h"
#include "misc.h"

/* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
#if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY)
#undef HAVE_DEV_PTMX
#endif

#ifdef HAVE_PTY_H
# include <pty.h>
#endif
#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
# include <sys/stropts.h>
#endif

#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif

/*
 * Allocates and opens a pty.  Returns 0 if no pty could be allocated, or
 * nonzero if a pty was successfully allocated.  On success, open file
 * descriptors for the pty and tty sides and the name of the tty side are
 * returned (the buffer must be able to hold at least 64 characters).
 */

int
pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
{
#if defined(HAVE_OPENPTY) || defined(BSD4_4)
	/* openpty(3) exists in OSF/1 and some other os'es */
	char *name;
	int i;

	i = openpty(ptyfd, ttyfd, NULL, NULL, NULL);
	if (i < 0) {
		error("openpty: %.100s", strerror(errno));
		return 0;
	}
	name = ttyname(*ttyfd);
	if (!name)
		fatal("openpty returns device for which ttyname fails.");

	strlcpy(namebuf, name, namebuflen);	/* possible truncation */
	return 1;
#else /* HAVE_OPENPTY */
#ifdef HAVE__GETPTY
	/*
	 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
	 * pty's automagically when needed
	 */
	char *slave;

	slave = _getpty(ptyfd, O_RDWR, 0622, 0);
	if (slave == NULL) {
		error("_getpty: %.100s", strerror(errno));
		return 0;
	}
	strlcpy(namebuf, slave, namebuflen);
	/* Open the slave side. */
	*ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
	if (*ttyfd < 0) {
		error("%.200s: %.100s", namebuf, strerror(errno));
		close(*ptyfd);
		return 0;
	}
	return 1;
#else /* HAVE__GETPTY */
#if defined(HAVE_DEV_PTMX)
	/*
	 * This code is used e.g. on Solaris 2.x.  (Note that Solaris 2.3
	 * also has bsd-style ptys, but they simply do not work.)
	 */
	int ptm;
	char *pts;
	mysig_t old_signal;

	ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY);
	if (ptm < 0) {
		error("/dev/ptmx: %.100s", strerror(errno));
		return 0;
	}
	old_signal = mysignal(SIGCHLD, SIG_DFL);
	if (grantpt(ptm) < 0) {
		error("grantpt: %.100s", strerror(errno));
		return 0;
	}
	mysignal(SIGCHLD, old_signal);
	if (unlockpt(ptm) < 0) {
		error("unlockpt: %.100s", strerror(errno));
		return 0;
	}
	pts = ptsname(ptm);
	if (pts == NULL)
		error("Slave pty side name could not be obtained.");
	strlcpy(namebuf, pts, namebuflen);
	*ptyfd = ptm;

	/* Open the slave side. */
	*ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
	if (*ttyfd < 0) {
		error("%.100s: %.100s", namebuf, strerror(errno));
		close(*ptyfd);
		return 0;
	}
#ifndef HAVE_CYGWIN
	/*
	 * Push the appropriate streams modules, as described in Solaris pts(7).
	 * HP-UX pts(7) doesn't have ttcompat module.
	 */
	if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
		error("ioctl I_PUSH ptem: %.100s", strerror(errno));
	if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
		error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
#ifndef __hpux
	if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
		error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
#endif
#endif
	return 1;
#else /* HAVE_DEV_PTMX */
#ifdef HAVE_DEV_PTS_AND_PTC
	/* AIX-style pty code. */
	const char *name;

	*ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY);
	if (*ptyfd < 0) {
		error("Could not open /dev/ptc: %.100s", strerror(errno));
		return 0;
	}
	name = ttyname(*ptyfd);
	if (!name)
		fatal("Open of /dev/ptc returns device for which ttyname fails.");
	strlcpy(namebuf, name, namebuflen);
	*ttyfd = open(name, O_RDWR | O_NOCTTY);
	if (*ttyfd < 0) {
		error("Could not open pty slave side %.100s: %.100s",
		    name, strerror(errno));
		close(*ptyfd);
		return 0;
	}
	return 1;
#else /* HAVE_DEV_PTS_AND_PTC */
#if defined(_CRAY) && !defined(_CRAYSV2)
	char buf[64];
	int i;
	int highpty;

#ifdef _SC_CRAY_NPTY
	highpty = sysconf(_SC_CRAY_NPTY);
	if (highpty == -1)
		highpty = 128;
#else
	highpty = 128;
#endif

	for (i = 0; i < highpty; i++) {
		snprintf(buf, sizeof(buf), "/dev/pty/%03d", i);
		*ptyfd = open(buf, O_RDWR|O_NOCTTY);
		if (*ptyfd < 0)
			continue;
		snprintf(namebuf, namebuflen, "/dev/ttyp%03d", i);
		/* Open the slave side. */
		*ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
		if (*ttyfd < 0) {
			error("%.100s: %.100s", namebuf, strerror(errno));
			close(*ptyfd);
			return 0;
		}
		return 1;
	}
	return 0;
#else
	/* BSD-style pty code. */
	char buf[64];
	int i;
	const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
	const char *ptyminors = "0123456789abcdef";
	int num_minors = strlen(ptyminors);
	int num_ptys = strlen(ptymajors) * num_minors;
	struct termios tio;

	for (i = 0; i < num_ptys; i++) {
		snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
			 ptyminors[i % num_minors]);
		snprintf(namebuf, namebuflen, "/dev/tty%c%c",
		    ptymajors[i / num_minors], ptyminors[i % num_minors]);

		*ptyfd = open(buf, O_RDWR | O_NOCTTY);
		if (*ptyfd < 0) {
			/* Try SCO style naming */
			snprintf(buf, sizeof buf, "/dev/ptyp%d", i);
			snprintf(namebuf, namebuflen, "/dev/ttyp%d", i);
			*ptyfd = open(buf, O_RDWR | O_NOCTTY);
			if (*ptyfd < 0)
				continue;
		}

		/* Open the slave side. */
		*ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
		if (*ttyfd < 0) {
			error("%.100s: %.100s", namebuf, strerror(errno));
			close(*ptyfd);
			return 0;
		}
		/* set tty modes to a sane state for broken clients */
		if (tcgetattr(*ptyfd, &tio) < 0)
			log("Getting tty modes for pty failed: %.100s", strerror(errno));
		else {
			tio.c_lflag |= (ECHO | ISIG | ICANON);
			tio.c_oflag |= (OPOST | ONLCR);
			tio.c_iflag |= ICRNL;

			/* Set the new modes for the terminal. */
			if (tcsetattr(*ptyfd, TCSANOW, &tio) < 0)
				log("Setting tty modes for pty failed: %.100s", strerror(errno));
		}

		return 1;
	}
	return 0;
#endif /* CRAY */
#endif /* HAVE_DEV_PTS_AND_PTC */
#endif /* HAVE_DEV_PTMX */
#endif /* HAVE__GETPTY */
#endif /* HAVE_OPENPTY */
}

/* Releases the tty.  Its ownership is returned to root, and permissions to 0666. */

void
pty_release(const char *ttyname)
{
	if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0)
		error("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
	if (chmod(ttyname, (mode_t) 0666) < 0)
		error("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
}

/* Makes the tty the processes controlling tty and sets it to sane modes. */

void
pty_make_controlling_tty(int *ttyfd, const char *ttyname)
{
	int fd;
#ifdef USE_VHANGUP
	void *old;
#endif /* USE_VHANGUP */

#if defined(_CRAY) && !defined(_CRAYSV2)
	if (setsid() < 0)
		error("setsid: %.100s", strerror(errno));

	fd = open(ttyname, O_RDWR|O_NOCTTY);
	if (fd != -1) {
		mysignal(SIGHUP, SIG_IGN);
		ioctl(fd, TCVHUP, (char *)NULL);
		mysignal(SIGHUP, SIG_DFL);
		setpgid(0, 0);
		close(fd);
	} else {
		error("Failed to disconnect from controlling tty.");
	}

	debug("Setting controlling tty using TCSETCTTY.");
	ioctl(*ttyfd, TCSETCTTY, NULL);
	fd = open("/dev/tty", O_RDWR);
	if (fd < 0)
		error("%.100s: %.100s", ttyname, strerror(errno));
	close(*ttyfd);
	*ttyfd = fd;
#else /* _CRAY */

	/* First disconnect from the old controlling tty. */
#ifdef TIOCNOTTY
	fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
	if (fd >= 0) {
		(void) ioctl(fd, TIOCNOTTY, NULL);
		close(fd);
	}
#endif /* TIOCNOTTY */
	if (setsid() < 0)
		error("setsid: %.100s", strerror(errno));

	/*
	 * Verify that we are successfully disconnected from the controlling
	 * tty.
	 */
	fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
	if (fd >= 0) {
		error("Failed to disconnect from controlling tty.");
		close(fd);
	}
	/* Make it our controlling tty. */
#ifdef TIOCSCTTY
	debug("Setting controlling tty using TIOCSCTTY.");
	if (ioctl(*ttyfd, TIOCSCTTY, NULL) < 0)
		error("ioctl(TIOCSCTTY): %.100s", strerror(errno));
#endif /* TIOCSCTTY */
#ifdef HAVE_NEWS4
	if (setpgrp(0,0) < 0)
		error("SETPGRP %s",strerror(errno));
#endif /* HAVE_NEWS4 */
#ifdef USE_VHANGUP
	old = mysignal(SIGHUP, SIG_IGN);
	vhangup();
	mysignal(SIGHUP, old);
#endif /* USE_VHANGUP */
	fd = open(ttyname, O_RDWR);
	if (fd < 0) {
		error("%.100s: %.100s", ttyname, strerror(errno));
	} else {
#ifdef USE_VHANGUP
		close(*ttyfd);
		*ttyfd = fd;
#else /* USE_VHANGUP */
		close(fd);
#endif /* USE_VHANGUP */
	}
	/* Verify that we now have a controlling tty. */
	fd = open(_PATH_TTY, O_WRONLY);
	if (fd < 0)
		error("open /dev/tty failed - could not set controlling tty: %.100s",
		    strerror(errno));
	else 
		close(fd);
#endif /* _CRAY */
}

/* Changes the window size associated with the pty. */

void
pty_change_window_size(int ptyfd, int row, int col,
	int xpixel, int ypixel)
{
	struct winsize w;

	w.ws_row = row;
	w.ws_col = col;
	w.ws_xpixel = xpixel;
	w.ws_ypixel = ypixel;
	(void) ioctl(ptyfd, TIOCSWINSZ, &w);
}

void
pty_setowner(struct passwd *pw, const char *ttyname)
{
	struct group *grp;
	gid_t gid;
	mode_t mode;
	struct stat st;

	/* Determine the group to make the owner of the tty. */
	grp = getgrnam("tty");
	if (grp) {
		gid = grp->gr_gid;
		mode = S_IRUSR | S_IWUSR | S_IWGRP;
	} else {
		gid = pw->pw_gid;
		mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
	}

	/*
	 * Change owner and mode of the tty as required.
	 * Warn but continue if filesystem is read-only and the uids match/
	 * tty is owned by root.
	 */
	if (stat(ttyname, &st))
		fatal("stat(%.100s) failed: %.100s", ttyname,
		    strerror(errno));

	if (st.st_uid != pw->pw_uid || st.st_gid != gid) {
		if (chown(ttyname, pw->pw_uid, gid) < 0) {
			if (errno == EROFS &&
			    (st.st_uid == pw->pw_uid || st.st_uid == 0))
				error("chown(%.100s, %u, %u) failed: %.100s",
				    ttyname, (u_int)pw->pw_uid, (u_int)gid,
				    strerror(errno));
			else
				fatal("chown(%.100s, %u, %u) failed: %.100s",
				    ttyname, (u_int)pw->pw_uid, (u_int)gid,
				    strerror(errno));
		}
	}

	if ((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != mode) {
		if (chmod(ttyname, mode) < 0) {
			if (errno == EROFS &&
			    (st.st_mode & (S_IRGRP | S_IROTH)) == 0)
				error("chmod(%.100s, 0%o) failed: %.100s",
				    ttyname, mode, strerror(errno));
			else
				fatal("chmod(%.100s, 0%o) failed: %.100s",
				    ttyname, mode, strerror(errno));
		}
	}
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	* Author: Tatu Ylonen <ylo@cs.hut.fi>
5260325f	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5260325f	4	* All rights reserved
5260325f	5	* Allocating a pseudo-terminal, and making it the controlling tty.
6ae2364d	6	*
bcbf86ec	7	* As far as I am concerned, the code I have written for this software
	8	* can be used freely for any purpose. Any derived versions of this
	9	* software must be clearly marked as such, and if the derived work is
	10	* incompatible with the protocol description in the RFC file, it must be
	11	* called by a name other than "ssh" or "Secure Shell".
5260325f	12	*/
8efc0c15	13
8efc0c15	14	#include "includes.h"
d0a1c5d1	15	RCSID("$OpenBSD: sshpty.c,v 1.7 2002/06/24 17:57:20 deraadt Exp $");
8efc0c15	16
884bcb37	17	#ifdef HAVE_UTIL_H
	18	# include <util.h>
	19	#endif /* HAVE_UTIL_H */
	20
1729c161	21	#include "sshpty.h"
42f11eb2	22	#include "log.h"
5ad9f968	23	#include "misc.h"
5260325f	24
8efc0c15	25	/* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
	26	#if defined(HAVE__GETPTY) \|\| defined(HAVE_OPENPTY)
	27	#undef HAVE_DEV_PTMX
	28	#endif
	29
6d8c4ea4	30	#ifdef HAVE_PTY_H
	31	# include <pty.h>
	32	#endif
	33	#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
	34	# include <sys/stropts.h>
	35	#endif
	36
8efc0c15	37	#ifndef O_NOCTTY
	38	#define O_NOCTTY 0
	39	#endif
	40
aa3378df	41	/*
	42	* Allocates and opens a pty. Returns 0 if no pty could be allocated, or
	43	* nonzero if a pty was successfully allocated. On success, open file
	44	* descriptors for the pty and tty sides and the name of the tty side are
	45	* returned (the buffer must be able to hold at least 64 characters).
	46	*/
8efc0c15	47
6ae2364d	48	int
a408af76	49	pty_allocate(int ptyfd, int ttyfd, char *namebuf, int namebuflen)
8efc0c15	50	{
a408af76	51	#if defined(HAVE_OPENPTY) \|\| defined(BSD4_4)
5260325f	52	/* openpty(3) exists in OSF/1 and some other os'es */
b82f1310	53	char *name;
5260325f	54	int i;
8efc0c15	55
b82f1310	56	i = openpty(ptyfd, ttyfd, NULL, NULL, NULL);
5260325f	57	if (i < 0) {
	58	error("openpty: %.100s", strerror(errno));
	59	return 0;
	60	}
b82f1310	61	name = ttyname(*ttyfd);
	62	if (!name)
	63	fatal("openpty returns device for which ttyname fails.");
	64
	65	strlcpy(namebuf, name, namebuflen); /* possible truncation */
5260325f	66	return 1;
8efc0c15	67	#else /* HAVE_OPENPTY */
8efc0c15	68	#ifdef HAVE__GETPTY
aa3378df	69	/*
	70	* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
	71	* pty's automagically when needed
	72	*/
5260325f	73	char *slave;
	74
	75	slave = _getpty(ptyfd, O_RDWR, 0622, 0);
	76	if (slave == NULL) {
	77	error("_getpty: %.100s", strerror(errno));
	78	return 0;
	79	}
a408af76	80	strlcpy(namebuf, slave, namebuflen);
5260325f	81	/* Open the slave side. */
	82	*ttyfd = open(namebuf, O_RDWR \| O_NOCTTY);
	83	if (*ttyfd < 0) {
	84	error("%.200s: %.100s", namebuf, strerror(errno));
	85	close(*ptyfd);
	86	return 0;
	87	}
	88	return 1;
8efc0c15	89	#else /* HAVE__GETPTY */
a7effaac	90	#if defined(HAVE_DEV_PTMX)
aa3378df	91	/*
	92	* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
	93	* also has bsd-style ptys, but they simply do not work.)
	94	*/
5260325f	95	int ptm;
5260325f	96	char *pts;
5ad9f968	97	mysig_t old_signal;
5260325f	98
	99	ptm = open("/dev/ptmx", O_RDWR \| O_NOCTTY);
	100	if (ptm < 0) {
	101	error("/dev/ptmx: %.100s", strerror(errno));
	102	return 0;
	103	}
5ad9f968	104	old_signal = mysignal(SIGCHLD, SIG_DFL);
5260325f	105	if (grantpt(ptm) < 0) {
	106	error("grantpt: %.100s", strerror(errno));
	107	return 0;
	108	}
5ad9f968	109	mysignal(SIGCHLD, old_signal);
5260325f	110	if (unlockpt(ptm) < 0) {
	111	error("unlockpt: %.100s", strerror(errno));
	112	return 0;
	113	}
	114	pts = ptsname(ptm);
	115	if (pts == NULL)
	116	error("Slave pty side name could not be obtained.");
a408af76	117	strlcpy(namebuf, pts, namebuflen);
5260325f	118	*ptyfd = ptm;
	119
	120	/* Open the slave side. */
	121	*ttyfd = open(namebuf, O_RDWR \| O_NOCTTY);
	122	if (*ttyfd < 0) {
	123	error("%.100s: %.100s", namebuf, strerror(errno));
	124	close(*ptyfd);
	125	return 0;
	126	}
3c62e7eb	127	#ifndef HAVE_CYGWIN
96054e6f	128	/*
	129	* Push the appropriate streams modules, as described in Solaris pts(7).
	130	* HP-UX pts(7) doesn't have ttcompat module.
	131	*/
5260325f	132	if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
	133	error("ioctl I_PUSH ptem: %.100s", strerror(errno));
	134	if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
	135	error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
96054e6f	136	#ifndef __hpux
5260325f	137	if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
5260325f	138	error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
3c62e7eb	139	#endif
be48d23c	140	#endif
5260325f	141	return 1;
8efc0c15	142	#else /* HAVE_DEV_PTMX */
8efc0c15	143	#ifdef HAVE_DEV_PTS_AND_PTC
5260325f	144	/* AIX-style pty code. */
5260325f	145	const char *name;
8efc0c15	146
5260325f	147	*ptyfd = open("/dev/ptc", O_RDWR \| O_NOCTTY);
	148	if (*ptyfd < 0) {
	149	error("Could not open /dev/ptc: %.100s", strerror(errno));
	150	return 0;
	151	}
	152	name = ttyname(*ptyfd);
	153	if (!name)
	154	fatal("Open of /dev/ptc returns device for which ttyname fails.");
a408af76	155	strlcpy(namebuf, name, namebuflen);
5260325f	156	*ttyfd = open(name, O_RDWR \| O_NOCTTY);
	157	if (*ttyfd < 0) {
	158	error("Could not open pty slave side %.100s: %.100s",
184eed6a	159	name, strerror(errno));
5260325f	160	close(*ptyfd);
	161	return 0;
	162	}
	163	return 1;
8efc0c15	164	#else /* HAVE_DEV_PTS_AND_PTC */
ccbb983c	165	#if defined(_CRAY) && !defined(_CRAYSV2)
1a23ac2c	166	char buf[64];
875ec275	167	int i;
875ec275	168	int highpty;
1a23ac2c	169
1a23ac2c	170	#ifdef _SC_CRAY_NPTY
68187931	171	highpty = sysconf(_SC_CRAY_NPTY);
	172	if (highpty == -1)
	173	highpty = 128;
1a23ac2c	174	#else
68187931	175	highpty = 128;
1a23ac2c	176	#endif
1a23ac2c	177
68187931	178	for (i = 0; i < highpty; i++) {
	179	snprintf(buf, sizeof(buf), "/dev/pty/%03d", i);
	180	*ptyfd = open(buf, O_RDWR\|O_NOCTTY);
	181	if (*ptyfd < 0)
	182	continue;
	183	snprintf(namebuf, namebuflen, "/dev/ttyp%03d", i);
	184	/* Open the slave side. */
	185	*ttyfd = open(namebuf, O_RDWR\|O_NOCTTY);
	186	if (*ttyfd < 0) {
1a23ac2c	187	error("%.100s: %.100s", namebuf, strerror(errno));
68187931	188	close(*ptyfd);
5bd6962b	189	return 0;
68187931	190	}
	191	return 1;
	192	}
	193	return 0;
1a23ac2c	194	#else
5260325f	195	/* BSD-style pty code. */
	196	char buf[64];
	197	int i;
aa3378df	198	const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
5260325f	199	const char *ptyminors = "0123456789abcdef";
	200	int num_minors = strlen(ptyminors);
	201	int num_ptys = strlen(ptymajors) * num_minors;
f65fbec1	202	struct termios tio;
5260325f	203
	204	for (i = 0; i < num_ptys; i++) {
	205	snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
	206	ptyminors[i % num_minors]);
95f1eccc	207	snprintf(namebuf, namebuflen, "/dev/tty%c%c",
a408af76	208	ptymajors[i / num_minors], ptyminors[i % num_minors]);
5260325f	209
b5f90139	210	*ptyfd = open(buf, O_RDWR \| O_NOCTTY);
	211	if (*ptyfd < 0) {
	212	/* Try SCO style naming */
	213	snprintf(buf, sizeof buf, "/dev/ptyp%d", i);
	214	snprintf(namebuf, namebuflen, "/dev/ttyp%d", i);
	215	*ptyfd = open(buf, O_RDWR \| O_NOCTTY);
	216	if (*ptyfd < 0)
	217	continue;
2b87da3b	218	}
2b87da3b	219
5260325f	220	/* Open the slave side. */
	221	*ttyfd = open(namebuf, O_RDWR \| O_NOCTTY);
	222	if (*ttyfd < 0) {
	223	error("%.100s: %.100s", namebuf, strerror(errno));
	224	close(*ptyfd);
	225	return 0;
	226	}
f65fbec1	227	/* set tty modes to a sane state for broken clients */
	228	if (tcgetattr(*ptyfd, &tio) < 0)
	229	log("Getting tty modes for pty failed: %.100s", strerror(errno));
	230	else {
	231	tio.c_lflag \|= (ECHO \| ISIG \| ICANON);
	232	tio.c_oflag \|= (OPOST \| ONLCR);
	233	tio.c_iflag \|= ICRNL;
	234
	235	/* Set the new modes for the terminal. */
	236	if (tcsetattr(*ptyfd, TCSANOW, &tio) < 0)
	237	log("Setting tty modes for pty failed: %.100s", strerror(errno));
	238	}
	239
5260325f	240	return 1;
8efc0c15	241	}
5260325f	242	return 0;
1a23ac2c	243	#endif /* CRAY */
8efc0c15	244	#endif /* HAVE_DEV_PTS_AND_PTC */
	245	#endif /* HAVE_DEV_PTMX */
	246	#endif /* HAVE__GETPTY */
	247	#endif /* HAVE_OPENPTY */
	248	}
	249
5260325f	250	/* Releases the tty. Its ownership is returned to root, and permissions to 0666. */
8efc0c15	251
6ae2364d	252	void
5260325f	253	pty_release(const char *ttyname)
8efc0c15	254	{
3276571c	255	if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0)
817175bc	256	error("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
3276571c	257	if (chmod(ttyname, (mode_t) 0666) < 0)
817175bc	258	error("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
8efc0c15	259	}
	260
	261	/* Makes the tty the processes controlling tty and sets it to sane modes. */
	262
6ae2364d	263	void
5260325f	264	pty_make_controlling_tty(int ttyfd, const char ttyname)
8efc0c15	265	{
1a23ac2c	266	int fd;
8140f2aa	267	#ifdef USE_VHANGUP
	268	void *old;
	269	#endif /* USE_VHANGUP */
1a23ac2c	270
ccbb983c	271	#if defined(_CRAY) && !defined(_CRAYSV2)
68187931	272	if (setsid() < 0)
68187931	273	error("setsid: %.100s", strerror(errno));
1a23ac2c	274
68187931	275	fd = open(ttyname, O_RDWR\|O_NOCTTY);
68187931	276	if (fd != -1) {
8140f2aa	277	mysignal(SIGHUP, SIG_IGN);
68187931	278	ioctl(fd, TCVHUP, (char *)NULL);
8140f2aa	279	mysignal(SIGHUP, SIG_DFL);
68187931	280	setpgid(0, 0);
68187931	281	close(fd);
1a23ac2c	282	} else {
68187931	283	error("Failed to disconnect from controlling tty.");
1a23ac2c	284	}
1a23ac2c	285
68187931	286	debug("Setting controlling tty using TCSETCTTY.");
	287	ioctl(*ttyfd, TCSETCTTY, NULL);
	288	fd = open("/dev/tty", O_RDWR);
	289	if (fd < 0)
	290	error("%.100s: %.100s", ttyname, strerror(errno));
1a23ac2c	291	close(*ttyfd);
875ec275	292	*ttyfd = fd;
8140f2aa	293	#else /* _CRAY */
8efc0c15	294
5260325f	295	/* First disconnect from the old controlling tty. */
8efc0c15	296	#ifdef TIOCNOTTY
5ca51e19	297	fd = open(_PATH_TTY, O_RDWR \| O_NOCTTY);
5260325f	298	if (fd >= 0) {
	299	(void) ioctl(fd, TIOCNOTTY, NULL);
	300	close(fd);
	301	}
8efc0c15	302	#endif /* TIOCNOTTY */
5260325f	303	if (setsid() < 0)
	304	error("setsid: %.100s", strerror(errno));
	305
aa3378df	306	/*
	307	* Verify that we are successfully disconnected from the controlling
	308	* tty.
	309	*/
5ca51e19	310	fd = open(_PATH_TTY, O_RDWR \| O_NOCTTY);
5260325f	311	if (fd >= 0) {
	312	error("Failed to disconnect from controlling tty.");
	313	close(fd);
	314	}
	315	/* Make it our controlling tty. */
8efc0c15	316	#ifdef TIOCSCTTY
5260325f	317	debug("Setting controlling tty using TIOCSCTTY.");
a3bf38d0	318	if (ioctl(*ttyfd, TIOCSCTTY, NULL) < 0)
a3bf38d0	319	error("ioctl(TIOCSCTTY): %.100s", strerror(errno));
8efc0c15	320	#endif /* TIOCSCTTY */
66d6c27e	321	#ifdef HAVE_NEWS4
	322	if (setpgrp(0,0) < 0)
	323	error("SETPGRP %s",strerror(errno));
	324	#endif /* HAVE_NEWS4 */
3c62e7eb	325	#ifdef USE_VHANGUP
8140f2aa	326	old = mysignal(SIGHUP, SIG_IGN);
4e577b89	327	vhangup();
8140f2aa	328	mysignal(SIGHUP, old);
3c62e7eb	329	#endif /* USE_VHANGUP */
5260325f	330	fd = open(ttyname, O_RDWR);
4e577b89	331	if (fd < 0) {
5260325f	332	error("%.100s: %.100s", ttyname, strerror(errno));
4e577b89	333	} else {
3c62e7eb	334	#ifdef USE_VHANGUP
4e577b89	335	close(*ttyfd);
4e577b89	336	*ttyfd = fd;
3c62e7eb	337	#else /* USE_VHANGUP */
5260325f	338	close(fd);
3c62e7eb	339	#endif /* USE_VHANGUP */
4e577b89	340	}
5260325f	341	/* Verify that we now have a controlling tty. */
5ca51e19	342	fd = open(_PATH_TTY, O_WRONLY);
5260325f	343	if (fd < 0)
5260325f	344	error("open /dev/tty failed - could not set controlling tty: %.100s",
184eed6a	345	strerror(errno));
f09ce20a	346	else
5260325f	347	close(fd);
8140f2aa	348	#endif /* _CRAY */
8efc0c15	349	}
	350
	351	/* Changes the window size associated with the pty. */
	352
6ae2364d	353	void
5260325f	354	pty_change_window_size(int ptyfd, int row, int col,
184eed6a	355	int xpixel, int ypixel)
8efc0c15	356	{
5260325f	357	struct winsize w;
f09ce20a	358
5260325f	359	w.ws_row = row;
	360	w.ws_col = col;
	361	w.ws_xpixel = xpixel;
	362	w.ws_ypixel = ypixel;
	363	(void) ioctl(ptyfd, TIOCSWINSZ, &w);
8efc0c15	364	}
817175bc	365
	366	void
	367	pty_setowner(struct passwd pw, const char ttyname)
	368	{
	369	struct group *grp;
	370	gid_t gid;
	371	mode_t mode;
227e8e86	372	struct stat st;
817175bc	373
	374	/* Determine the group to make the owner of the tty. */
	375	grp = getgrnam("tty");
	376	if (grp) {
	377	gid = grp->gr_gid;
	378	mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
	379	} else {
	380	gid = pw->pw_gid;
	381	mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
	382	}
	383
227e8e86	384	/*
227e8e86	385	* Change owner and mode of the tty as required.
4f7893dc	386	* Warn but continue if filesystem is read-only and the uids match/
4f7893dc	387	* tty is owned by root.
227e8e86	388	*/
	389	if (stat(ttyname, &st))
	390	fatal("stat(%.100s) failed: %.100s", ttyname,
	391	strerror(errno));
	392
	393	if (st.st_uid != pw->pw_uid \|\| st.st_gid != gid) {
	394	if (chown(ttyname, pw->pw_uid, gid) < 0) {
184eed6a	395	if (errno == EROFS &&
f09ce20a	396	(st.st_uid == pw->pw_uid \|\| st.st_uid == 0))
d6133f43	397	error("chown(%.100s, %u, %u) failed: %.100s",
d0a1c5d1	398	ttyname, (u_int)pw->pw_uid, (u_int)gid,
184eed6a	399	strerror(errno));
227e8e86	400	else
d6133f43	401	fatal("chown(%.100s, %u, %u) failed: %.100s",
d0a1c5d1	402	ttyname, (u_int)pw->pw_uid, (u_int)gid,
184eed6a	403	strerror(errno));
227e8e86	404	}
	405	}
	406
	407	if ((st.st_mode & (S_IRWXU\|S_IRWXG\|S_IRWXO)) != mode) {
	408	if (chmod(ttyname, mode) < 0) {
	409	if (errno == EROFS &&
	410	(st.st_mode & (S_IRGRP \| S_IROTH)) == 0)
	411	error("chmod(%.100s, 0%o) failed: %.100s",
184eed6a	412	ttyname, mode, strerror(errno));
227e8e86	413	else
227e8e86	414	fatal("chmod(%.100s, 0%o) failed: %.100s",
184eed6a	415	ttyname, mode, strerror(errno));
227e8e86	416	}
227e8e86	417	}
817175bc	418	}